Fix toNativeUtf8/Utf16 memory leak

Signed-off-by: Sunbreak <[email protected]>

Author: Sunbreak

lib/src/logic_conf_linux.dart

@@ -19,7 +19,10 @@ class LogicConfLinux extends LogicConfPlatform {
 
   @override
   bool openDevice(String path) {
-    var descriptor = _libc.open2(path.toNativeUtf8().cast(), O_RDWR);
+    var nativeUtf8 = path.toNativeUtf8();
+    var descriptor = _libc.open2(nativeUtf8.cast(), O_RDWR);
+    malloc.free(nativeUtf8);
+
     if (descriptor < 0) {
       // TODO strerror()
       print('open2 error');

lib/src/logic_conf_macos.dart

@@ -25,7 +25,10 @@ class LogicConfMacos extends LogicConfPlatform {
 
   @override
   bool openDevice(String path) {
-    _entryPtr = _io.IORegistryEntryFromPath(kIOMasterPortDefault, path.toNativeUtf8().cast());
+    var nativeUtf8 = path.toNativeUtf8();
+    _entryPtr = _io.IORegistryEntryFromPath(kIOMasterPortDefault, nativeUtf8.cast());
+    malloc.free(nativeUtf8);
+
     if (_entryPtr == nullptr) {
         print('IORegistryEntryFromPath error');
         return false;

lib/src/logic_conf_windows.dart

@@ -59,7 +59,10 @@ class LogicConfWindows extends LogicConfPlatform {
         // FIXME Utf16.decode
         var devicePath = utf8.decode(deviceInterfaceDetailDataPtr.getDevicePathData(requiredSizePtr.value));
 
-        devHandle = CreateFile(devicePath.toNativeUtf16(), 0, FILE_SHARE_READ | FILE_SHARE_WRITE, nullptr, OPEN_EXISTING, 0, NULL);
+        var nativeUtf16 = devicePath.toNativeUtf16();
+        devHandle = CreateFile(nativeUtf16, 0, FILE_SHARE_READ | FILE_SHARE_WRITE, nullptr, OPEN_EXISTING, 0, NULL);
+        malloc.free(nativeUtf16);
+
         if (devHandle == INVALID_HANDLE_VALUE) {
           print('CreateFile error ${GetLastError()}');
           continue;
@@ -125,15 +128,18 @@ class LogicConfWindows extends LogicConfPlatform {
 
   @override
   bool openDevice(String path) {
+    var nativeUtf16 = path.toNativeUtf16();
     _devHandle = CreateFile(
-      path.toNativeUtf16(),
+      nativeUtf16,
       GENERIC_READ | GENERIC_WRITE,
       FILE_SHARE_READ | FILE_SHARE_WRITE,
       nullptr,
       OPEN_EXISTING,
       0,
       NULL,
     );
+    malloc.free(nativeUtf16);
+
     return _devHandle != INVALID_HANDLE_VALUE;
   }